sundy58:
Actually no. They only user interface is 2 push buttons to adjust the time up and down. That's on digital clocks, analog clocks have no user input. Impulse analog clocks won't even run without a master clock, the master clock puts out 24 VDC at 58 seconds after and removes it at the minute to cause a solenoid to advance the minute hand through a series of gears.There are clocks available that have a DST table in them but the user interface is clunky. The only display o most of these clocks is a 7 segment display, a LCD would be a unnecessary expense that would likely price the clock out of the market.
Just in case you are not aware, there is simple, cheap technology available now to configure a clock etc. for timezone / DST rules using a smartphone or laptop.
The principle is similar to configuring a network device such as router, WLAN repeater etc.
The user pushes the 'configure' button on the device (clock in this case) and the device starts up a WLAN access point and Web server. The user finds this on his smartphone (or laptop etc.) and is presented with a menu which he completes including, in this case, time zone information and DST rules etc. etc.
The ESP8266 module (costs the price of a beer) is available with all that.
I'm currently working on a clock project for my personal use which uses exactly that technology and is a light adaption of what I found here.
I've had to adapt it to handle DST, using a lightly modified Arduino Timezone library, because the design there allows the user to change only the offset from UTC which has to be done twice a year. I'm currently polishing the user interface.
It would even be possible to extend the configuration to include the full DST rule so, for example, if a government changes the dates that DST is to be applied, it could be done without a software upgrade.